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We wrote an article before Using Qt ScrollBar to realize scrolling screen time selector I also wrote an article QComboBox custom settings - the drop-down list is customized as a table Today, we will use the previous two articles to implement a time range selection control. First, let's look at the effect. After seeing the effect, we decompo ...

Introduction of SPFA and application of negative judgment ring SPFA (queue optimization algorithm) is an algorithm for finding the shortest path of a single source. Another important function of SPFA is to judge the negative loop. If it is not necessary to judge the negative ring, Dijkstra is recommended Main ideas and methods: Set an array ...

5.Client Library CPP client library: Provide library/interface for ros programming For example, set up a node, publish a message, invoke a service, and so on Provides support for both cpp and python languages, typically using cpp roscpp rospy 5.1 roscpp ros provides an interface for using cpp and topic,service,param, and so on ROS CP ...

🌟 Initial structure _ start: point to the first element _ Find: points to the next position of the last element _ End of storage: the next location of the last in the space namespace gpy { template <class T> class vecrot { public: typedef T* iterator; ~vector() { delete[] _start; _start = _finsh = _endofstorage = n ...

Bottom Source Profiling Move, Right Value, Perfect Forwarding 1 Basic concepts Moving semantics: Do not copy the object, just make the new object name point to the object referred to by the original object name, and leave the original object pointed to empty. Perfect Forwarding: You can write a function template that accepts any paramet ...

Associative containers - overview of set, multiset, map, and multimap knowledge points 1. Associated container:              The underlying implementation uses a red black tree. Initialization, traversal, count, find and insert (set and map need to judge whether the insertion is succes ...

There are five questions in total, with average difficulty. catalogue Number of eligible Elected representative Achievement statistics Recite the answer Beat the drum and pass the flowers Number of eligible Title Description: give   N and   k. Find a positive integer that is not less than N and satisfy that there are &nbsp ...

catalogue 1: Concept of C + + polymorphism   2: Implementation of C + + polymorphism 3: C + + virtual function 1. Items needing attention when using virtual functions           2. Pure virtual function 1: Concept of C + + polymorphism           "Polymorphism" means ...

[TOC] Creating and destroying objects in heap memory in C + + requires the keywords new and delete. New and delete are not only keywords in C + +, but also a special operator. memory allocation There are many ways to allocate and release memory in C + + distributionreleaseGenusCan I reloadmalloc()free()C functionmust notnewdeleteC + + expr ...

preface Errors and exceptions: Errors and exceptions are errors that occur during program compilation or running. The difference is that exceptions can be caught and handled by developers; Errors generally do not need to be handled by developers (and cannot be handled), such as memory overflow. If exceptions are not handled in time, errors may ...